Union melt of bottom shell during construction of Liberty ship at shipyards in California during World War II

A process during construction of a Liberty Ship at shipyards in California during World War 2. Workers union melt bottom shell with a machine. The machine moves, as it melts. A worker assists in the process with a tool. Another worker drills into the bottom shell. (Note: May include scenes from Kaiser Shipyard in Richmond, California as well as Hunters Point Naval Shipyard in San Francisco.)